Final answer:
To find the volume of the gas when the amount increases to 11.0 moles, we can use the concept of molar volume at STP.
Step-by-step explanation:
To solve this problem, we can use the concept of molar volume. The molar volume of a gas at standard temperature and pressure (STP) is 22.4 L per mole. So, in this case, we have a 5.50 mole sample of gas with a volume of 2.50 L. By using the relationship between moles and volume at STP, we can find the volume if the amount of gas is increased to 11.0 moles. Since the moles are doubled, the volume will also be doubled. Therefore, the volume would be 5.00 L (option C) if the amount increased to 11.0 moles.